dlls/ntdll/signal_i386.c

   1 /*
   2  * i386 signal handling routines
   3  *
   4  * Copyright 1999 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #ifdef __i386__
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <errno.h>
  27 #include <signal.h>
  28 #include <stdlib.h>
  29 #include <stdarg.h>
  30 #include <stdio.h>
  31 #include <sys/types.h>
  32 #ifdef HAVE_UNISTD_H
  33 # include <unistd.h>
  34 #endif
  35
  36 #ifdef HAVE_SYS_PARAM_H
  37 # include <sys/param.h>
  38 #endif
  39 #ifdef HAVE_SYSCALL_H
  40 # include <syscall.h>
  41 #else
  42 # ifdef HAVE_SYS_SYSCALL_H
  43 #  include <sys/syscall.h>
  44 # endif
  45 #endif
  46
  47 #ifdef HAVE_SYS_VM86_H
  48 # include <sys/vm86.h>
  49 #endif
  50
  51 #ifdef HAVE_SYS_SIGNAL_H
  52 # include <sys/signal.h>
  53 #endif
  54 #ifdef HAVE_SYS_SYSCTL_H
  55 # include <sys/sysctl.h>
  56 #endif
  57
  58 #include "windef.h"
  59 #include "wine/library.h"
  60 #include "ntdll_misc.h"
  61 #include "wine/exception.h"
  62 #include "wine/debug.h"
  63
  64 #ifdef HAVE_VALGRIND_MEMCHECK_H
  65 #include <valgrind/memcheck.h>
  66 #endif
  67
  68 #undef ERR  /* Solaris needs to define this */
  69
  70 /* not defined for x86, so copy the x86_64 definition */
  71 typedef struct DECLSPEC_ALIGN(16) _M128A
  72 {
  73     ULONGLONG Low;
  74     LONGLONG High;
  75 } M128A;
  76
  77 typedef struct
  78 {
  79     WORD ControlWord;
  80     WORD StatusWord;
  81     BYTE TagWord;
  82     BYTE Reserved1;
  83     WORD ErrorOpcode;
  84     DWORD ErrorOffset;
  85     WORD ErrorSelector;
  86     WORD Reserved2;
  87     DWORD DataOffset;
  88     WORD DataSelector;
  89     WORD Reserved3;
  90     DWORD MxCsr;
  91     DWORD MxCsr_Mask;
  92     M128A FloatRegisters[8];
  93     M128A XmmRegisters[16];
  94     BYTE Reserved4[96];
  95 } XMM_SAVE_AREA32;
  96
  97 /***********************************************************************
  98  * signal context platform-specific definitions
  99  */
 100
 101 #ifdef linux
 102
 103 typedef ucontext_t SIGCONTEXT;
 104
 105 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[REG_EAX])
 106 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[REG_EBX])
 107 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[REG_ECX])
 108 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[REG_EDX])
 109 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[REG_ESI])
 110 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[REG_EDI])
 111 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[REG_EBP])
 112 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[REG_ESP])
 113
 114 #define CS_sig(context)      ((context)->uc_mcontext.gregs[REG_CS])
 115 #define DS_sig(context)      ((context)->uc_mcontext.gregs[REG_DS])
 116 #define ES_sig(context)      ((context)->uc_mcontext.gregs[REG_ES])
 117 #define SS_sig(context)      ((context)->uc_mcontext.gregs[REG_SS])
 118 #define FS_sig(context)      ((context)->uc_mcontext.gregs[REG_FS])
 119 #define GS_sig(context)      ((context)->uc_mcontext.gregs[REG_GS])
 120
 121 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[REG_EFL])
 122 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[REG_EIP])
 123 #define TRAP_sig(context)    ((context)->uc_mcontext.gregs[REG_TRAPNO])
 124 #define ERROR_sig(context)   ((context)->uc_mcontext.gregs[REG_ERR])
 125
 126 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
 127 #define FPUX_sig(context)    (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)
 128
 129 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
 130 #define VIF_FLAG 0x00080000
 131 #define VIP_FLAG 0x00100000
 132
 133 int vm86_enter( void **vm86_ptr );
 134 void vm86_return(void);
 135 void vm86_return_end(void);
 136 __ASM_GLOBAL_FUNC(vm86_enter,
 137                   "pushl %ebp\n\t"
 138                   "movl %esp, %ebp\n\t"
 139                   "movl $166,%eax\n\t"  /*SYS_vm86*/
 140                   "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
 141                   "movl (%ecx),%ecx\n\t"
 142                   "pushl %ebx\n\t"
 143                   "movl $1,%ebx\n\t"    /*VM86_ENTER*/
 144                   "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
 145                   "pushl %fs\n\t"
 146                   "pushl %gs\n\t"
 147                   "int $0x80\n"
 148                   ".globl " __ASM_NAME("vm86_return") "\n\t"
 149                   __ASM_FUNC("vm86_return") "\n"
 150                   __ASM_NAME("vm86_return") ":\n\t"
 151                   "popl %gs\n\t"
 152                   "popl %fs\n\t"
 153                   "popl %ecx\n\t"
 154                   "popl %ebx\n\t"
 155                   "popl %ebp\n\t"
 156                   "testl %eax,%eax\n\t"
 157                   "jl 0f\n\t"
 158                   "cmpb $0,%al\n\t" /* VM86_SIGNAL */
 159                   "je " __ASM_NAME("vm86_enter") "\n\t"
 160                   "0:\n\t"
 161                   "movl 4(%esp),%ecx\n\t"  /* vm86_ptr */
 162                   "movl $0,(%ecx)\n\t"
 163                   ".globl " __ASM_NAME("vm86_return_end") "\n\t"
 164                   __ASM_FUNC("vm86_return_end") "\n"
 165                   __ASM_NAME("vm86_return_end") ":\n\t"
 166                   "ret" )
 167
 168 #ifdef HAVE_SYS_VM86_H
 169 # define __HAVE_VM86
 170 #endif
 171
 172 #endif  /* linux */
 173
 174 #ifdef BSDI
 175
 176 #include <machine/frame.h>
 177 typedef struct trapframe SIGCONTEXT;
 178
 179 #define EAX_sig(context)     ((context)->tf_eax)
 180 #define EBX_sig(context)     ((context)->tf_ebx)
 181 #define ECX_sig(context)     ((context)->tf_ecx)
 182 #define EDX_sig(context)     ((context)->tf_edx)
 183 #define ESI_sig(context)     ((context)->tf_esi)
 184 #define EDI_sig(context)     ((context)->tf_edi)
 185 #define EBP_sig(context)     ((context)->tf_ebp)
 186
 187 #define CS_sig(context)      ((context)->tf_cs)
 188 #define DS_sig(context)      ((context)->tf_ds)
 189 #define ES_sig(context)      ((context)->tf_es)
 190 #define SS_sig(context)      ((context)->tf_ss)
 191
 192 #define EFL_sig(context)     ((context)->tf_eflags)
 193
 194 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 195 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 196
 197 #define FPU_sig(context)     NULL  /* FIXME */
 198 #define FPUX_sig(context)    NULL  /* FIXME */
 199
 200 #endif /* bsdi */
 201
 202 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
 203
 204 typedef struct sigcontext SIGCONTEXT;
 205
 206 #define EAX_sig(context)     ((context)->sc_eax)
 207 #define EBX_sig(context)     ((context)->sc_ebx)
 208 #define ECX_sig(context)     ((context)->sc_ecx)
 209 #define EDX_sig(context)     ((context)->sc_edx)
 210 #define ESI_sig(context)     ((context)->sc_esi)
 211 #define EDI_sig(context)     ((context)->sc_edi)
 212 #define EBP_sig(context)     ((context)->sc_ebp)
 213
 214 #define CS_sig(context)      ((context)->sc_cs)
 215 #define DS_sig(context)      ((context)->sc_ds)
 216 #define ES_sig(context)      ((context)->sc_es)
 217 #define FS_sig(context)      ((context)->sc_fs)
 218 #define GS_sig(context)      ((context)->sc_gs)
 219 #define SS_sig(context)      ((context)->sc_ss)
 220
 221 #define TRAP_sig(context)    ((context)->sc_trapno)
 222 #define ERROR_sig(context)   ((context)->sc_err)
 223 #define EFL_sig(context)     ((context)->sc_eflags)
 224
 225 #define EIP_sig(context)     ((context)->sc_eip)
 226 #define ESP_sig(context)     ((context)->sc_esp)
 227
 228 #define FPU_sig(context)     NULL  /* FIXME */
 229 #define FPUX_sig(context)    NULL  /* FIXME */
 230
 231 #endif  /* *BSD */
 232
 233 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 234
 235 #ifdef _SCO_DS
 236 #include <sys/regset.h>
 237 #endif
 238 #include <sys/ucontext.h>
 239 typedef struct ucontext SIGCONTEXT;
 240
 241 #ifdef _SCO_DS
 242 #define gregs regs
 243 #endif
 244
 245 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 246 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 247 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 248 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 249 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 250 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 251 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 252
 253 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 254 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 255 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 256 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 257
 258 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 259 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 260
 261 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 262
 263 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 264 #ifdef UESP
 265 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[UESP])
 266 #elif defined(R_ESP)
 267 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 268 #else
 269 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 270 #endif
 271 #ifdef ERR
 272 #define ERROR_sig(context)   ((context)->uc_mcontext.gregs[ERR])
 273 #endif
 274 #ifdef TRAPNO
 275 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 276 #endif
 277
 278 #define FPU_sig(context)     NULL  /* FIXME */
 279 #define FPUX_sig(context)    NULL  /* FIXME */
 280
 281 #endif  /* svr4 || SCO_DS */
 282
 283 #ifdef __APPLE__
 284 # include <sys/ucontext.h>
 285
 286 typedef ucontext_t SIGCONTEXT;
 287
 288 /* work around silly renaming of struct members in OS X 10.5 */
 289 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
 290 #define EAX_sig(context)     ((context)->uc_mcontext->__ss.__eax)
 291 #define EBX_sig(context)     ((context)->uc_mcontext->__ss.__ebx)
 292 #define ECX_sig(context)     ((context)->uc_mcontext->__ss.__ecx)
 293 #define EDX_sig(context)     ((context)->uc_mcontext->__ss.__edx)
 294 #define ESI_sig(context)     ((context)->uc_mcontext->__ss.__esi)
 295 #define EDI_sig(context)     ((context)->uc_mcontext->__ss.__edi)
 296 #define EBP_sig(context)     ((context)->uc_mcontext->__ss.__ebp)
 297 #define CS_sig(context)      ((context)->uc_mcontext->__ss.__cs)
 298 #define DS_sig(context)      ((context)->uc_mcontext->__ss.__ds)
 299 #define ES_sig(context)      ((context)->uc_mcontext->__ss.__es)
 300 #define FS_sig(context)      ((context)->uc_mcontext->__ss.__fs)
 301 #define GS_sig(context)      ((context)->uc_mcontext->__ss.__gs)
 302 #define SS_sig(context)      ((context)->uc_mcontext->__ss.__ss)
 303 #define EFL_sig(context)     ((context)->uc_mcontext->__ss.__eflags)
 304 #define EIP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
 305 #define ESP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
 306 #define TRAP_sig(context)    ((context)->uc_mcontext->__es.__trapno)
 307 #define ERROR_sig(context)   ((context)->uc_mcontext->__es.__err)
 308 #define FPU_sig(context)     NULL
 309 #define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
 310 #else
 311 #define EAX_sig(context)     ((context)->uc_mcontext->ss.eax)
 312 #define EBX_sig(context)     ((context)->uc_mcontext->ss.ebx)
 313 #define ECX_sig(context)     ((context)->uc_mcontext->ss.ecx)
 314 #define EDX_sig(context)     ((context)->uc_mcontext->ss.edx)
 315 #define ESI_sig(context)     ((context)->uc_mcontext->ss.esi)
 316 #define EDI_sig(context)     ((context)->uc_mcontext->ss.edi)
 317 #define EBP_sig(context)     ((context)->uc_mcontext->ss.ebp)
 318 #define CS_sig(context)      ((context)->uc_mcontext->ss.cs)
 319 #define DS_sig(context)      ((context)->uc_mcontext->ss.ds)
 320 #define ES_sig(context)      ((context)->uc_mcontext->ss.es)
 321 #define FS_sig(context)      ((context)->uc_mcontext->ss.fs)
 322 #define GS_sig(context)      ((context)->uc_mcontext->ss.gs)
 323 #define SS_sig(context)      ((context)->uc_mcontext->ss.ss)
 324 #define EFL_sig(context)     ((context)->uc_mcontext->ss.eflags)
 325 #define EIP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
 326 #define ESP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
 327 #define TRAP_sig(context)    ((context)->uc_mcontext->es.trapno)
 328 #define ERROR_sig(context)   ((context)->uc_mcontext->es.err)
 329 #define FPU_sig(context)     NULL
 330 #define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
 331 #endif
 332
 333 #endif /* __APPLE__ */
 334
 335 #if defined(__NetBSD__)
 336 # include <sys/ucontext.h>
 337 # include <sys/types.h>
 338 # include <signal.h>
 339
 340 typedef ucontext_t SIGCONTEXT;
 341
 342 #define EAX_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EAX])
 343 #define EBX_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EBX])
 344 #define ECX_sig(context)       ((context)->uc_mcontext.__gregs[_REG_ECX])
 345 #define EDX_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EDX])
 346 #define ESI_sig(context)       ((context)->uc_mcontext.__gregs[_REG_ESI])
 347 #define EDI_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EDI])
 348 #define EBP_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EBP])
 349 #define ESP_sig(context)       _UC_MACHINE_SP(context)
 350
 351 #define CS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_CS])
 352 #define DS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_DS])
 353 #define ES_sig(context)        ((context)->uc_mcontext.__gregs[_REG_ES])
 354 #define SS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_SS])
 355 #define FS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_FS])
 356 #define GS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_GS])
 357
 358 #define EFL_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EFL])
 359 #define EIP_sig(context)       _UC_MACHINE_PC(context)
 360 #define TRAP_sig(context)      ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
 361 #define ERROR_sig(context)     ((context)->uc_mcontext.__gregs[_REG_ERR])
 362
 363 #define FPU_sig(context)     NULL
 364 #define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))
 365
 366 #define T_MCHK T_MCA
 367 #define T_XMMFLT T_XMM
 368
 369 #endif /* __NetBSD__ */
 370
 371 WINE_DEFAULT_DEBUG_CHANNEL(seh);
 372
 373 typedef int (*wine_signal_handler)(unsigned int sig);
 374
 375 static const size_t teb_size = 4096;  /* we reserve one page for the TEB */
 376 static size_t signal_stack_mask;
 377 static size_t signal_stack_size;
 378
 379 static wine_signal_handler handlers[256];
 380
 381 static int fpux_support;  /* whether the CPU support extended fpu context */
 382
 383 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
 384
 385 enum i386_trap_code
 386 {
 387     TRAP_x86_UNKNOWN    = -1,  /* Unknown fault (TRAP_sig not defined) */
 388 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
 389     TRAP_x86_DIVIDE     = T_DIVIDE,     /* Division by zero exception */
 390     TRAP_x86_TRCTRAP    = T_TRCTRAP,    /* Single-step exception */
 391     TRAP_x86_NMI        = T_NMI,        /* NMI interrupt */
 392     TRAP_x86_BPTFLT     = T_BPTFLT,     /* Breakpoint exception */
 393     TRAP_x86_OFLOW      = T_OFLOW,      /* Overflow exception */
 394     TRAP_x86_BOUND      = T_BOUND,      /* Bound range exception */
 395     TRAP_x86_PRIVINFLT  = T_PRIVINFLT,  /* Invalid opcode exception */
 396     TRAP_x86_DNA        = T_DNA,        /* Device not available exception */
 397     TRAP_x86_DOUBLEFLT  = T_DOUBLEFLT,  /* Double fault exception */
 398     TRAP_x86_FPOPFLT    = T_FPOPFLT,    /* Coprocessor segment overrun */
 399     TRAP_x86_TSSFLT     = T_TSSFLT,     /* Invalid TSS exception */
 400     TRAP_x86_SEGNPFLT   = T_SEGNPFLT,   /* Segment not present exception */
 401     TRAP_x86_STKFLT     = T_STKFLT,     /* Stack fault */
 402     TRAP_x86_PROTFLT    = T_PROTFLT,    /* General protection fault */
 403     TRAP_x86_PAGEFLT    = T_PAGEFLT,    /* Page fault */
 404     TRAP_x86_ARITHTRAP  = T_ARITHTRAP,  /* Floating point exception */
 405     TRAP_x86_ALIGNFLT   = T_ALIGNFLT,   /* Alignment check exception */
 406     TRAP_x86_MCHK       = T_MCHK,       /* Machine check exception */
 407     TRAP_x86_CACHEFLT   = T_XMMFLT      /* Cache flush exception */
 408 #else
 409     TRAP_x86_DIVIDE     = 0,   /* Division by zero exception */
 410     TRAP_x86_TRCTRAP    = 1,   /* Single-step exception */
 411     TRAP_x86_NMI        = 2,   /* NMI interrupt */
 412     TRAP_x86_BPTFLT     = 3,   /* Breakpoint exception */
 413     TRAP_x86_OFLOW      = 4,   /* Overflow exception */
 414     TRAP_x86_BOUND      = 5,   /* Bound range exception */
 415     TRAP_x86_PRIVINFLT  = 6,   /* Invalid opcode exception */
 416     TRAP_x86_DNA        = 7,   /* Device not available exception */
 417     TRAP_x86_DOUBLEFLT  = 8,   /* Double fault exception */
 418     TRAP_x86_FPOPFLT    = 9,   /* Coprocessor segment overrun */
 419     TRAP_x86_TSSFLT     = 10,  /* Invalid TSS exception */
 420     TRAP_x86_SEGNPFLT   = 11,  /* Segment not present exception */
 421     TRAP_x86_STKFLT     = 12,  /* Stack fault */
 422     TRAP_x86_PROTFLT    = 13,  /* General protection fault */
 423     TRAP_x86_PAGEFLT    = 14,  /* Page fault */
 424     TRAP_x86_ARITHTRAP  = 16,  /* Floating point exception */
 425     TRAP_x86_ALIGNFLT   = 17,  /* Alignment check exception */
 426     TRAP_x86_MCHK       = 18,  /* Machine check exception */
 427     TRAP_x86_CACHEFLT   = 19   /* SIMD exception (via SIGFPE) if CPU is SSE capable
 428                                   otherwise Cache flush exception (via SIGSEV) */
 429 #endif
 430 };
 431
 432
 433 /***********************************************************************
 434  *           dispatch_signal
 435  */
 436 static inline int dispatch_signal(unsigned int sig)
 437 {
 438     if (handlers[sig] == NULL) return 0;
 439     return handlers[sig](sig);
 440 }
 441
 442
 443 /***********************************************************************
 444  *           get_trap_code
 445  *
 446  * Get the trap code for a signal.
 447  */
 448 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
 449 {
 450 #ifdef TRAP_sig
 451     return TRAP_sig(sigcontext);
 452 #else
 453     return TRAP_x86_UNKNOWN;  /* unknown trap code */
 454 #endif
 455 }
 456
 457 /***********************************************************************
 458  *           get_error_code
 459  *
 460  * Get the error code for a signal.
 461  */
 462 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
 463 {
 464 #ifdef ERROR_sig
 465     return ERROR_sig(sigcontext);
 466 #else
 467     return 0;
 468 #endif
 469 }
 470
 471 /***********************************************************************
 472  *           get_signal_stack
 473  *
 474  * Get the base of the signal stack for the current thread.
 475  */
 476 static inline void *get_signal_stack(void)
 477 {
 478     return (char *)NtCurrentTeb() + 4096;
 479 }
 480
 481
 482 /***********************************************************************
 483  *           get_current_teb
 484  *
 485  * Get the current teb based on the stack pointer.
 486  */
 487 static inline TEB *get_current_teb(void)
 488 {
 489     unsigned long esp;
 490     __asm__("movl %%esp,%0" : "=g" (esp) );
 491     return (TEB *)(esp & ~signal_stack_mask);
 492 }
 493
 494
 495 #ifdef __HAVE_VM86
 496 /***********************************************************************
 497  *           save_vm86_context
 498  *
 499  * Set the register values from a vm86 structure.
 500  */
 501 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 502 {
 503     context->ContextFlags = CONTEXT_FULL;
 504     context->Eax    = vm86->regs.eax;
 505     context->Ebx    = vm86->regs.ebx;
 506     context->Ecx    = vm86->regs.ecx;
 507     context->Edx    = vm86->regs.edx;
 508     context->Esi    = vm86->regs.esi;
 509     context->Edi    = vm86->regs.edi;
 510     context->Esp    = vm86->regs.esp;
 511     context->Ebp    = vm86->regs.ebp;
 512     context->Eip    = vm86->regs.eip;
 513     context->SegCs  = vm86->regs.cs;
 514     context->SegDs  = vm86->regs.ds;
 515     context->SegEs  = vm86->regs.es;
 516     context->SegFs  = vm86->regs.fs;
 517     context->SegGs  = vm86->regs.gs;
 518     context->SegSs  = vm86->regs.ss;
 519     context->EFlags = vm86->regs.eflags;
 520 }
 521
 522
 523 /***********************************************************************
 524  *           restore_vm86_context
 525  *
 526  * Build a vm86 structure from the register values.
 527  */
 528 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 529 {
 530     vm86->regs.eax    = context->Eax;
 531     vm86->regs.ebx    = context->Ebx;
 532     vm86->regs.ecx    = context->Ecx;
 533     vm86->regs.edx    = context->Edx;
 534     vm86->regs.esi    = context->Esi;
 535     vm86->regs.edi    = context->Edi;
 536     vm86->regs.esp    = context->Esp;
 537     vm86->regs.ebp    = context->Ebp;
 538     vm86->regs.eip    = context->Eip;
 539     vm86->regs.cs     = context->SegCs;
 540     vm86->regs.ds     = context->SegDs;
 541     vm86->regs.es     = context->SegEs;
 542     vm86->regs.fs     = context->SegFs;
 543     vm86->regs.gs     = context->SegGs;
 544     vm86->regs.ss     = context->SegSs;
 545     vm86->regs.eflags = context->EFlags;
 546 }
 547
 548
 549 /**********************************************************************
 550  *              merge_vm86_pending_flags
 551  *
 552  * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
 553  * raises exception if there are pending events and VIF flag
 554  * has been turned on.
 555  *
 556  * Called from __wine_enter_vm86 because vm86_enter
 557  * doesn't check for pending events.
 558  *
 559  * Called from raise_vm86_sti_exception to check for
 560  * pending events in a signal safe way.
 561  */
 562 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
 563 {
 564     BOOL check_pending = TRUE;
 565     struct vm86plus_struct *vm86 =
 566         (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
 567
 568     /*
 569      * In order to prevent a race when SIGUSR2 occurs while
 570      * we are returning from exception handler, pending events
 571      * will be rechecked after each raised exception.
 572      */
 573     while (check_pending && get_vm86_teb_info()->vm86_pending)
 574     {
 575         check_pending = FALSE;
 576         ntdll_get_thread_data()->vm86_ptr = NULL;
 577
 578         /*
 579          * If VIF is set, throw exception.
 580          * Note that SIGUSR2 may turn VIF flag off so
 581          * VIF check must occur only when TEB.vm86_ptr is NULL.
 582          */
 583         if (vm86->regs.eflags & VIF_FLAG)
 584         {
 585             CONTEXT vcontext;
 586             save_vm86_context( &vcontext, vm86 );
 587
 588             rec->ExceptionCode    = EXCEPTION_VM86_STI;
 589             rec->ExceptionFlags   = EXCEPTION_CONTINUABLE;
 590             rec->ExceptionRecord  = NULL;
 591             rec->NumberParameters = 0;
 592             rec->ExceptionAddress = (LPVOID)vcontext.Eip;
 593
 594             vcontext.EFlags &= ~VIP_FLAG;
 595             get_vm86_teb_info()->vm86_pending = 0;
 596             __regs_RtlRaiseException( rec, &vcontext );
 597
 598             restore_vm86_context( &vcontext, vm86 );
 599             check_pending = TRUE;
 600         }
 601
 602         ntdll_get_thread_data()->vm86_ptr = vm86;
 603     }
 604
 605     /*
 606      * Merge VIP flags in a signal safe way. This requires
 607      * that the following operation compiles into atomic
 608      * instruction.
 609      */
 610     vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
 611 }
 612 #endif /* __HAVE_VM86 */
 613
 614
 615 #ifdef __sun
 616
 617 /* We have to workaround two Solaris breakages:
 618  * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
 619  *   code crash badly.
 620  * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
 621  *   are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
 622  */
 623
 624 extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
 625 __ASM_GLOBAL_FUNC( sigaction_syscall,
 626                   "movl $0x62,%eax\n\t"
 627                   "int $0x91\n\t"
 628                   "ret" )
 629
 630 /* assume the same libc handler is used for all signals */
 631 static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
 632
 633 static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
 634 {
 635     struct ntdll_thread_data *thread_data;
 636
 637     __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
 638
 639     thread_data = (struct ntdll_thread_data *)get_current_teb()->SystemReserved2;
 640     wine_set_fs( thread_data->fs );
 641     wine_set_gs( thread_data->gs );
 642
 643     libc_sigacthandler( signal, siginfo, sigcontext );
 644 }
 645
 646 static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
 647 {
 648     struct sigaction real_act;
 649
 650     if (sigaction( sig, new, old ) == -1) return -1;
 651
 652     /* retrieve the real handler and flags with a direct syscall */
 653     sigaction_syscall( sig, NULL, &real_act );
 654     libc_sigacthandler = real_act.sa_sigaction;
 655     real_act.sa_sigaction = wine_sigacthandler;
 656     sigaction_syscall( sig, &real_act, NULL );
 657     return 0;
 658 }
 659 #define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
 660
 661 #endif
 662
 663 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
 664
 665
 666 /***********************************************************************
 667  *           init_handler
 668  *
 669  * Handler initialization when the full context is not needed.
 670  * Return the stack pointer to use for pushing the exception data.
 671  */
 672 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
 673 {
 674     TEB *teb = get_current_teb();
 675
 676     /* get %fs and %gs at time of the fault */
 677 #ifdef FS_sig
 678     *fs = LOWORD(FS_sig(sigcontext));
 679 #else
 680     *fs = wine_get_fs();
 681 #endif
 682 #ifdef GS_sig
 683     *gs = LOWORD(GS_sig(sigcontext));
 684 #else
 685     *gs = wine_get_gs();
 686 #endif
 687
 688 #ifndef __sun  /* see above for Solaris handling */
 689     {
 690         struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
 691         wine_set_fs( thread_data->fs );
 692         wine_set_gs( thread_data->gs );
 693     }
 694 #endif
 695
 696     if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
 697         !wine_ldt_is_system(SS_sig(sigcontext)))  /* 16-bit mode */
 698     {
 699         /*
 700          * Win16 or DOS protected mode. Note that during switch
 701          * from 16-bit mode to linear mode, CS may be set to system
 702          * segment before FS is restored. Fortunately, in this case
 703          * SS is still non-system segment. This is why both CS and SS
 704          * are checked.
 705          */
 706         return teb->WOW32Reserved;
 707     }
 708     return (void *)(ESP_sig(sigcontext) & ~3);
 709 }
 710
 711
 712 /***********************************************************************
 713  *           save_fpu
 714  *
 715  * Save the thread FPU context.
 716  */
 717 static inline void save_fpu( CONTEXT *context )
 718 {
 719 #ifdef __GNUC__
 720     context->ContextFlags |= CONTEXT_FLOATING_POINT;
 721     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 722 #endif
 723 }
 724
 725
 726 /***********************************************************************
 727  *           save_fpux
 728  *
 729  * Save the thread FPU extended context.
 730  */
 731 static inline void save_fpux( CONTEXT *context )
 732 {
 733 #ifdef __GNUC__
 734     /* we have to enforce alignment by hand */
 735     char buffer[sizeof(XMM_SAVE_AREA32) + 16];
 736     XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
 737
 738     __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
 739     context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
 740     memcpy( context->ExtendedRegisters, state, sizeof(*state) );
 741 #endif
 742 }
 743
 744
 745 /***********************************************************************
 746  *           restore_fpu
 747  *
 748  * Restore the FPU context to a sigcontext.
 749  */
 750 static inline void restore_fpu( const CONTEXT *context )
 751 {
 752     FLOATING_SAVE_AREA float_status = context->FloatSave;
 753     /* reset the current interrupt status */
 754     float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
 755 #ifdef __GNUC__
 756     __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
 757 #endif  /* __GNUC__ */
 758 }
 759
 760
 761 /***********************************************************************
 762  *           restore_fpux
 763  *
 764  * Restore the FPU extended context to a sigcontext.
 765  */
 766 static inline void restore_fpux( const CONTEXT *context )
 767 {
 768 #ifdef __GNUC__
 769     /* we have to enforce alignment by hand */
 770     char buffer[sizeof(XMM_SAVE_AREA32) + 16];
 771     XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
 772
 773     memcpy( state, context->ExtendedRegisters, sizeof(*state) );
 774     /* reset the current interrupt status */
 775     state->StatusWord &= state->ControlWord | 0xff80;
 776     __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
 777 #endif
 778 }
 779
 780
 781 /***********************************************************************
 782  *           fpux_to_fpu
 783  *
 784  * Build a standard FPU context from an extended one.
 785  */
 786 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
 787 {
 788     unsigned int i, tag, stack_top;
 789
 790     fpu->ControlWord   = fpux->ControlWord | 0xffff0000;
 791     fpu->StatusWord    = fpux->StatusWord | 0xffff0000;
 792     fpu->ErrorOffset   = fpux->ErrorOffset;
 793     fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
 794     fpu->DataOffset    = fpux->DataOffset;
 795     fpu->DataSelector  = fpux->DataSelector;
 796     fpu->Cr0NpxState   = fpux->StatusWord | 0xffff0000;
 797
 798     stack_top = (fpux->StatusWord >> 11) & 7;
 799     fpu->TagWord = 0xffff0000;
 800     for (i = 0; i < 8; i++)
 801     {
 802         memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
 803         if (!(fpux->TagWord & (1 << i))) tag = 3;  /* empty */
 804         else
 805         {
 806             const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
 807             if ((reg->High & 0x7fff) == 0x7fff)  /* exponent all ones */
 808             {
 809                 tag = 2;  /* special */
 810             }
 811             else if (!(reg->High & 0x7fff))  /* exponent all zeroes */
 812             {
 813                 if (reg->Low) tag = 2;  /* special */
 814                 else tag = 1;  /* zero */
 815             }
 816             else
 817             {
 818                 if (reg->Low >> 63) tag = 0;  /* valid */
 819                 else tag = 2;  /* special */
 820             }
 821         }
 822         fpu->TagWord |= tag << (2 * i);
 823     }
 824 }
 825
 826
 827 /***********************************************************************
 828  *           save_context
 829  *
 830  * Build a context structure from the signal info.
 831  */
 832 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
 833 {
 834     struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 835     FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
 836     XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
 837
 838     memset(context, 0, sizeof(*context));
 839     context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
 840     context->Eax          = EAX_sig(sigcontext);
 841     context->Ebx          = EBX_sig(sigcontext);
 842     context->Ecx          = ECX_sig(sigcontext);
 843     context->Edx          = EDX_sig(sigcontext);
 844     context->Esi          = ESI_sig(sigcontext);
 845     context->Edi          = EDI_sig(sigcontext);
 846     context->Ebp          = EBP_sig(sigcontext);
 847     context->EFlags       = EFL_sig(sigcontext);
 848     context->Eip          = EIP_sig(sigcontext);
 849     context->Esp          = ESP_sig(sigcontext);
 850     context->SegCs        = LOWORD(CS_sig(sigcontext));
 851     context->SegDs        = LOWORD(DS_sig(sigcontext));
 852     context->SegEs        = LOWORD(ES_sig(sigcontext));
 853     context->SegFs        = fs;
 854     context->SegGs        = gs;
 855     context->SegSs        = LOWORD(SS_sig(sigcontext));
 856     context->Dr0          = regs->dr0;
 857     context->Dr1          = regs->dr1;
 858     context->Dr2          = regs->dr2;
 859     context->Dr3          = regs->dr3;
 860     context->Dr6          = regs->dr6;
 861     context->Dr7          = regs->dr7;
 862
 863     if (fpu)
 864     {
 865         context->ContextFlags |= CONTEXT_FLOATING_POINT;
 866         context->FloatSave = *fpu;
 867     }
 868     if (fpux)
 869     {
 870         context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
 871         memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
 872         fpux_support = 1;
 873         if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
 874     }
 875     if (!fpu && !fpux) save_fpu( context );
 876 }
 877
 878
 879 /***********************************************************************
 880  *           restore_context
 881  *
 882  * Restore the signal info from the context.
 883  */
 884 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 885 {
 886     struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 887     FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
 888     XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
 889
 890     regs->dr0 = context->Dr0;
 891     regs->dr1 = context->Dr1;
 892     regs->dr2 = context->Dr2;
 893     regs->dr3 = context->Dr3;
 894     regs->dr6 = context->Dr6;
 895     regs->dr7 = context->Dr7;
 896     EAX_sig(sigcontext) = context->Eax;
 897     EBX_sig(sigcontext) = context->Ebx;
 898     ECX_sig(sigcontext) = context->Ecx;
 899     EDX_sig(sigcontext) = context->Edx;
 900     ESI_sig(sigcontext) = context->Esi;
 901     EDI_sig(sigcontext) = context->Edi;
 902     EBP_sig(sigcontext) = context->Ebp;
 903     EFL_sig(sigcontext) = context->EFlags;
 904     EIP_sig(sigcontext) = context->Eip;
 905     ESP_sig(sigcontext) = context->Esp;
 906     CS_sig(sigcontext)  = context->SegCs;
 907     DS_sig(sigcontext)  = context->SegDs;
 908     ES_sig(sigcontext)  = context->SegEs;
 909     SS_sig(sigcontext)  = context->SegSs;
 910 #ifdef GS_sig
 911     GS_sig(sigcontext)  = context->SegGs;
 912 #else
 913     wine_set_gs( context->SegGs );
 914 #endif
 915 #ifdef FS_sig
 916     FS_sig(sigcontext)  = context->SegFs;
 917 #else
 918     wine_set_fs( context->SegFs );
 919 #endif
 920
 921     if (fpu) *fpu = context->FloatSave;
 922     if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
 923     if (!fpu && !fpux) restore_fpu( context );
 924 }
 925
 926
 927 /***********************************************************************
 928  *              RtlCaptureContext (NTDLL.@)
 929  */
 930 void WINAPI __regs_RtlCaptureContext( CONTEXT *context, CONTEXT *regs )
 931 {
 932     *context = *regs;
 933     if (fpux_support) save_fpux( context );
 934     else save_fpu( context );
 935 }
 936 DEFINE_REGS_ENTRYPOINT( RtlCaptureContext, 1 )
 937
 938
 939 /***********************************************************************
 940  *           set_cpu_context
 941  *
 942  * Set the new CPU context. Used by NtSetContextThread.
 943  */
 944 void set_cpu_context( const CONTEXT *context )
 945 {
 946     DWORD flags = context->ContextFlags & ~CONTEXT_i386;
 947
 948     if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
 949     else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
 950
 951     if (flags & CONTEXT_DEBUG_REGISTERS)
 952     {
 953         struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 954         regs->dr0 = context->Dr0;
 955         regs->dr1 = context->Dr1;
 956         regs->dr2 = context->Dr2;
 957         regs->dr3 = context->Dr3;
 958         regs->dr6 = context->Dr6;
 959         regs->dr7 = context->Dr7;
 960     }
 961     if (flags & CONTEXT_FULL)
 962     {
 963         if (!(flags & CONTEXT_CONTROL))
 964             FIXME( "setting partial context (%x) not supported\n", flags );
 965         else if (flags & CONTEXT_SEGMENTS)
 966             __wine_call_from_32_restore_regs( context );
 967         else
 968         {
 969             CONTEXT newcontext = *context;
 970             newcontext.SegDs = wine_get_ds();
 971             newcontext.SegEs = wine_get_es();
 972             newcontext.SegFs = wine_get_fs();
 973             newcontext.SegGs = wine_get_gs();
 974             __wine_call_from_32_restore_regs( &newcontext );
 975         }
 976     }
 977 }
 978
 979
 980 /***********************************************************************
 981  *           copy_context
 982  *
 983  * Copy a register context according to the flags.
 984  */
 985 void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
 986 {
 987     flags &= ~CONTEXT_i386;  /* get rid of CPU id */
 988     if (flags & CONTEXT_INTEGER)
 989     {
 990         to->Eax = from->Eax;
 991         to->Ebx = from->Ebx;
 992         to->Ecx = from->Ecx;
 993         to->Edx = from->Edx;
 994         to->Esi = from->Esi;
 995         to->Edi = from->Edi;
 996     }
 997     if (flags & CONTEXT_CONTROL)
 998     {
 999         to->Ebp    = from->Ebp;
1000         to->Esp    = from->Esp;
1001         to->Eip    = from->Eip;
1002         to->SegCs  = from->SegCs;
1003         to->SegSs  = from->SegSs;
1004         to->EFlags = from->EFlags;
1005     }
1006     if (flags & CONTEXT_SEGMENTS)
1007     {
1008         to->SegDs = from->SegDs;
1009         to->SegEs = from->SegEs;
1010         to->SegFs = from->SegFs;
1011         to->SegGs = from->SegGs;
1012     }
1013     if (flags & CONTEXT_DEBUG_REGISTERS)
1014     {
1015         to->Dr0 = from->Dr0;
1016         to->Dr1 = from->Dr1;
1017         to->Dr2 = from->Dr2;
1018         to->Dr3 = from->Dr3;
1019         to->Dr6 = from->Dr6;
1020         to->Dr7 = from->Dr7;
1021     }
1022     if (flags & CONTEXT_FLOATING_POINT)
1023     {
1024         to->FloatSave = from->FloatSave;
1025     }
1026     if (flags & CONTEXT_EXTENDED_REGISTERS)
1027     {
1028         memcpy( to->ExtendedRegisters, from->ExtendedRegisters, sizeof(to->ExtendedRegisters) );
1029     }
1030 }
1031
1032
1033 /***********************************************************************
1034  *           is_privileged_instr
1035  *
1036  * Check if the fault location is a privileged instruction.
1037  * Based on the instruction emulation code in dlls/kernel/instr.c.
1038  */
1039 static inline DWORD is_privileged_instr( CONTEXT86 *context )
1040 {
1041     const BYTE *instr;
1042     unsigned int prefix_count = 0;
1043
1044     if (!wine_ldt_is_system( context->SegCs )) return 0;
1045     instr = (BYTE *)context->Eip;
1046
1047     for (;;) switch(*instr)
1048     {
1049     /* instruction prefixes */
1050     case 0x2e:  /* %cs: */
1051     case 0x36:  /* %ss: */
1052     case 0x3e:  /* %ds: */
1053     case 0x26:  /* %es: */
1054     case 0x64:  /* %fs: */
1055     case 0x65:  /* %gs: */
1056     case 0x66:  /* opcode size */
1057     case 0x67:  /* addr size */
1058     case 0xf0:  /* lock */
1059     case 0xf2:  /* repne */
1060     case 0xf3:  /* repe */
1061         if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
1062         instr++;
1063         continue;
1064
1065     case 0x0f: /* extended instruction */
1066         switch(instr[1])
1067         {
1068         case 0x20: /* mov crX, reg */
1069         case 0x21: /* mov drX, reg */
1070         case 0x22: /* mov reg, crX */
1071         case 0x23: /* mov reg drX */
1072             return EXCEPTION_PRIV_INSTRUCTION;
1073         }
1074         return 0;
1075     case 0x6c: /* insb (%dx) */
1076     case 0x6d: /* insl (%dx) */
1077     case 0x6e: /* outsb (%dx) */
1078     case 0x6f: /* outsl (%dx) */
1079     case 0xcd: /* int $xx */
1080     case 0xe4: /* inb al,XX */
1081     case 0xe5: /* in (e)ax,XX */
1082     case 0xe6: /* outb XX,al */
1083     case 0xe7: /* out XX,(e)ax */
1084     case 0xec: /* inb (%dx),%al */
1085     case 0xed: /* inl (%dx),%eax */
1086     case 0xee: /* outb %al,(%dx) */
1087     case 0xef: /* outl %eax,(%dx) */
1088     case 0xf4: /* hlt */
1089     case 0xfa: /* cli */
1090     case 0xfb: /* sti */
1091         return EXCEPTION_PRIV_INSTRUCTION;
1092     default:
1093         return 0;
1094     }
1095 }
1096
1097
1098 #include "pshpack1.h"
1099 struct atl_thunk
1100 {
1101     DWORD movl;  /* movl this,4(%esp) */
1102     DWORD this;
1103     BYTE  jmp;   /* jmp func */
1104     int   func;
1105 };
1106 #include "poppack.h"
1107
1108 /**********************************************************************
1109  *              check_atl_thunk
1110  *
1111  * Check if code destination is an ATL thunk, and emulate it if so.
1112  */
1113 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
1114 {
1115     const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
1116     BOOL ret = FALSE;
1117
1118     __TRY
1119     {
1120         if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
1121         {
1122             *((DWORD *)context->Esp + 1) = thunk->this;
1123             context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
1124             TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1125                    thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1126             ret = TRUE;
1127         }
1128     }
1129     __EXCEPT_PAGE_FAULT
1130     {
1131         return FALSE;
1132     }
1133     __ENDTRY
1134     return ret;
1135 }
1136
1137
1138 /***********************************************************************
1139  *           setup_exception_record
1140  *
1141  * Setup the exception record and context on the thread stack.
1142  */
1143 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1144                                                  WORD fs, WORD gs, raise_func func )
1145 {
1146     struct stack_layout
1147     {
1148         void             *ret_addr;      /* return address from raise_func */
1149         EXCEPTION_RECORD *rec_ptr;       /* first arg for raise_func */
1150         CONTEXT          *context_ptr;   /* second arg for raise_func */
1151         CONTEXT           context;
1152         EXCEPTION_RECORD  rec;
1153         DWORD             ebp;
1154         DWORD             eip;
1155     } *stack = stack_ptr;
1156     DWORD exception_code = 0;
1157
1158     /* stack sanity checks */
1159
1160     if ((char *)stack >= (char *)get_signal_stack() &&
1161         (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1162     {
1163         WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1164                   GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1165                   (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1166                   NtCurrentTeb()->Tib.StackBase );
1167         abort_thread(1);
1168     }
1169
1170     if (stack - 1 > stack || /* check for overflow in subtraction */
1171         (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1172         (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1173     {
1174         WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1175               GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1176               (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1177               NtCurrentTeb()->Tib.StackBase );
1178     }
1179     else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1180     {
1181         /* stack overflow on last page, unrecoverable */
1182         UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1183         WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1184                   diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1185                   (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1186                   NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1187         abort_thread(1);
1188     }
1189     else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1190     {
1191         /* stack access below stack limit, may be recoverable */
1192         if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1193         else
1194         {
1195             UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1196             WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1197                       diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1198                       (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1199                       NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1200             abort_thread(1);
1201         }
1202     }
1203
1204     stack--;  /* push the stack_layout structure */
1205 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1206     VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1207 #elif defined(VALGRIND_MAKE_WRITABLE)
1208     VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1209 #endif
1210     stack->ret_addr     = (void *)0xdeadbabe;  /* raise_func must not return */
1211     stack->rec_ptr      = &stack->rec;
1212     stack->context_ptr  = &stack->context;
1213
1214     stack->rec.ExceptionRecord  = NULL;
1215     stack->rec.ExceptionCode    = exception_code;
1216     stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1217     stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1218     stack->rec.NumberParameters = 0;
1219
1220     save_context( &stack->context, sigcontext, fs, gs );
1221
1222     /* now modify the sigcontext to return to the raise function */
1223     ESP_sig(sigcontext) = (DWORD)stack;
1224     EIP_sig(sigcontext) = (DWORD)func;
1225     /* clear single-step, direction, and align check flag */
1226     EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1227     CS_sig(sigcontext)  = wine_get_cs();
1228     DS_sig(sigcontext)  = wine_get_ds();
1229     ES_sig(sigcontext)  = wine_get_es();
1230     FS_sig(sigcontext)  = wine_get_fs();
1231     GS_sig(sigcontext)  = wine_get_gs();
1232     SS_sig(sigcontext)  = wine_get_ss();
1233
1234     return stack->rec_ptr;
1235 }
1236
1237
1238 /***********************************************************************
1239  *           setup_exception
1240  *
1241  * Setup a proper stack frame for the raise function, and modify the
1242  * sigcontext so that the return from the signal handler will call
1243  * the raise function.
1244  */
1245 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1246 {
1247     WORD fs, gs;
1248     void *stack = init_handler( sigcontext, &fs, &gs );
1249
1250     return setup_exception_record( sigcontext, stack, fs, gs, func );
1251 }
1252
1253
1254 /***********************************************************************
1255  *           get_exception_context
1256  *
1257  * Get a pointer to the context built by setup_exception.
1258  */
1259 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1260 {
1261     return (CONTEXT *)rec - 1;  /* cf. stack_layout structure */
1262 }
1263
1264
1265 /**********************************************************************
1266  *              get_fpu_code
1267  *
1268  * Get the FPU exception code from the FPU status.
1269  */
1270 static inline DWORD get_fpu_code( const CONTEXT *context )
1271 {
1272     DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
1273
1274     if (status & 0x01)  /* IE */
1275     {
1276         if (status & 0x40)  /* SF */
1277             return EXCEPTION_FLT_STACK_CHECK;
1278         else
1279             return EXCEPTION_FLT_INVALID_OPERATION;
1280     }
1281     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
1282     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
1283     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
1284     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
1285     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
1286     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
1287 }
1288
1289
1290 /**********************************************************************
1291  *              raise_segv_exception
1292  */
1293 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1294 {
1295     switch(rec->ExceptionCode)
1296     {
1297     case EXCEPTION_ACCESS_VIOLATION:
1298         if (rec->NumberParameters == 2)
1299         {
1300             if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1301                 goto done;
1302             if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
1303                                                              rec->ExceptionInformation[0] )))
1304                 goto done;
1305         }
1306         break;
1307     case EXCEPTION_DATATYPE_MISALIGNMENT:
1308         /* FIXME: pass through exception handler first? */
1309         if (context->EFlags & 0x00040000)
1310         {
1311             /* Disable AC flag, return */
1312             context->EFlags &= ~0x00040000;
1313             goto done;
1314         }
1315         break;
1316     }
1317     __regs_RtlRaiseException( rec, context );
1318 done:
1319     NtSetContextThread( GetCurrentThread(), context );
1320 }
1321
1322
1323 /**********************************************************************
1324  *              raise_trap_exception
1325  */
1326 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1327 {
1328     if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1329     {
1330         struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1331
1332         /* when single stepping can't tell whether this is a hw bp or a
1333          * single step interrupt. try to avoid as much overhead as possible
1334          * and only do a server call if there is any hw bp enabled. */
1335
1336         if( !(context->EFlags & 0x100) || (regs->dr7 & 0xff) )
1337         {
1338             /* (possible) hardware breakpoint, fetch the debug registers */
1339             context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1340             NtGetContextThread(GetCurrentThread(), context);
1341             context->ContextFlags |= CONTEXT_FULL;  /* restore flags */
1342         }
1343
1344         context->EFlags &= ~0x100;  /* clear single-step flag */
1345     }
1346
1347     __regs_RtlRaiseException( rec, context );
1348     NtSetContextThread( GetCurrentThread(), context );
1349 }
1350
1351
1352 /**********************************************************************
1353  *              raise_exception
1354  *
1355  * Generic raise function for exceptions that don't need special treatment.
1356  */
1357 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1358 {
1359     __regs_RtlRaiseException( rec, context );
1360     NtSetContextThread( GetCurrentThread(), context );
1361 }
1362
1363
1364 #ifdef __HAVE_VM86
1365 /**********************************************************************
1366  *              raise_vm86_sti_exception
1367  */
1368 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1369 {
1370     /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1371     get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1372
1373     if (ntdll_get_thread_data()->vm86_ptr)
1374     {
1375         if (((char*)context->Eip >= (char*)vm86_return) &&
1376             ((char*)context->Eip <= (char*)vm86_return_end) &&
1377             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1378             /* exiting from VM86, can't throw */
1379             goto done;
1380         }
1381         merge_vm86_pending_flags( rec );
1382     }
1383     else if (get_vm86_teb_info()->dpmi_vif &&
1384              !wine_ldt_is_system(context->SegCs) &&
1385              !wine_ldt_is_system(context->SegSs))
1386     {
1387         /* Executing DPMI code and virtual interrupts are enabled. */
1388         get_vm86_teb_info()->vm86_pending = 0;
1389         __regs_RtlRaiseException( rec, context );
1390     }
1391 done:
1392     NtSetContextThread( GetCurrentThread(), context );
1393 }
1394
1395
1396 /**********************************************************************
1397  *              usr2_handler
1398  *
1399  * Handler for SIGUSR2.
1400  * We use it to signal that the running __wine_enter_vm86() should
1401  * immediately set VIP_FLAG, causing pending events to be handled
1402  * as early as possible.
1403  */
1404 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1405 {
1406     EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1407     rec->ExceptionCode = EXCEPTION_VM86_STI;
1408 }
1409 #endif /* __HAVE_VM86 */
1410
1411
1412 /**********************************************************************
1413  *              segv_handler
1414  *
1415  * Handler for SIGSEGV and related errors.
1416  */
1417 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1418 {
1419     WORD fs, gs;
1420     EXCEPTION_RECORD *rec;
1421     SIGCONTEXT *context = sigcontext;
1422     void *stack = init_handler( sigcontext, &fs, &gs );
1423
1424     /* check for page fault inside the thread stack */
1425     if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1426         (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1427         (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1428         virtual_handle_stack_fault( siginfo->si_addr ))
1429     {
1430         /* check if this was the last guard page */
1431         if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1432         {
1433             rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1434             rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1435         }
1436         return;
1437     }
1438
1439     rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1440     if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1441
1442     switch(get_trap_code(context))
1443     {
1444     case TRAP_x86_OFLOW:   /* Overflow exception */
1445         rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1446         break;
1447     case TRAP_x86_BOUND:   /* Bound range exception */
1448         rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1449         break;
1450     case TRAP_x86_PRIVINFLT:   /* Invalid opcode exception */
1451         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1452         break;
1453     case TRAP_x86_STKFLT:  /* Stack fault */
1454         rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1455         break;
1456     case TRAP_x86_SEGNPFLT:  /* Segment not present exception */
1457     case TRAP_x86_PROTFLT:   /* General protection fault */
1458     case TRAP_x86_UNKNOWN:   /* Unknown fault code */
1459         {
1460             WORD err = get_error_code(context);
1461             if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1462             rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1463             rec->NumberParameters = 2;
1464             rec->ExceptionInformation[0] = 0;
1465             /* if error contains a LDT selector, use that as fault address */
1466             if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1467                 rec->ExceptionInformation[1] = err & ~7;
1468             else
1469                 rec->ExceptionInformation[1] = 0xffffffff;
1470         }
1471         break;
1472     case TRAP_x86_PAGEFLT:  /* Page fault */
1473         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1474         rec->NumberParameters = 2;
1475         rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1476         rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1477         break;
1478     case TRAP_x86_ALIGNFLT:  /* Alignment check exception */
1479         rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1480         break;
1481     default:
1482         WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1483         /* fall through */
1484     case TRAP_x86_NMI:       /* NMI interrupt */
1485     case TRAP_x86_DNA:       /* Device not available exception */
1486     case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1487     case TRAP_x86_TSSFLT:    /* Invalid TSS exception */
1488     case TRAP_x86_MCHK:      /* Machine check exception */
1489     case TRAP_x86_CACHEFLT:  /* Cache flush exception */
1490         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1491         break;
1492     }
1493 }
1494
1495
1496 /**********************************************************************
1497  *              trap_handler
1498  *
1499  * Handler for SIGTRAP.
1500  */
1501 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1502 {
1503     SIGCONTEXT *context = sigcontext;
1504     EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1505
1506     switch(get_trap_code(context))
1507     {
1508     case TRAP_x86_TRCTRAP:  /* Single-step exception */
1509         rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1510         break;
1511     case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1512         rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1;  /* back up over the int3 instruction */
1513         /* fall through */
1514     default:
1515         rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1516         break;
1517     }
1518 }
1519
1520
1521 /**********************************************************************
1522  *              fpe_handler
1523  *
1524  * Handler for SIGFPE.
1525  */
1526 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1527 {
1528     CONTEXT *win_context;
1529     SIGCONTEXT *context = sigcontext;
1530     EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1531
1532     win_context = get_exception_context( rec );
1533
1534     switch(get_trap_code(context))
1535     {
1536     case TRAP_x86_DIVIDE:   /* Division by zero exception */
1537         rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1538         break;
1539     case TRAP_x86_FPOPFLT:   /* Coprocessor segment overrun */
1540         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1541         break;
1542     case TRAP_x86_ARITHTRAP:  /* Floating point exception */
1543     case TRAP_x86_UNKNOWN:    /* Unknown fault code */
1544         rec->ExceptionCode = get_fpu_code( win_context );
1545         rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
1546         break;
1547     case TRAP_x86_CACHEFLT:  /* SIMD exception */
1548         /* TODO:
1549          * Behaviour only tested for divide-by-zero exceptions
1550          * Check for other SIMD exceptions as well */
1551         if(siginfo->si_code != FPE_FLTDIV)
1552             FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1553                   siginfo->si_code);
1554
1555         rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1556         rec->NumberParameters = 1;
1557         /* no idea what meaning is actually behind this but that's what native does */
1558         rec->ExceptionInformation[0] = 0;
1559         break;
1560     default:
1561         WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1562         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1563         break;
1564     }
1565 }
1566
1567
1568 /**********************************************************************
1569  *              int_handler
1570  *
1571  * Handler for SIGINT.
1572  *
1573  * FIXME: should not be calling external functions on the signal stack.
1574  */
1575 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1576 {
1577     WORD fs, gs;
1578     init_handler( sigcontext, &fs, &gs );
1579     if (!dispatch_signal(SIGINT))
1580     {
1581         EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1582         rec->ExceptionCode = CONTROL_C_EXIT;
1583     }
1584 }
1585
1586 /**********************************************************************
1587  *              abrt_handler
1588  *
1589  * Handler for SIGABRT.
1590  */
1591 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1592 {
1593     EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1594     rec->ExceptionCode  = EXCEPTION_WINE_ASSERTION;
1595     rec->ExceptionFlags = EH_NONCONTINUABLE;
1596 }
1597
1598
1599 /**********************************************************************
1600  *              quit_handler
1601  *
1602  * Handler for SIGQUIT.
1603  */
1604 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1605 {
1606     WORD fs, gs;
1607     init_handler( sigcontext, &fs, &gs );
1608     abort_thread(0);
1609 }
1610
1611
1612 /**********************************************************************
1613  *              usr1_handler
1614  *
1615  * Handler for SIGUSR1, used to signal a thread that it got suspended.
1616  */
1617 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1618 {
1619     CONTEXT context;
1620     WORD fs, gs;
1621
1622     init_handler( sigcontext, &fs, &gs );
1623     save_context( &context, sigcontext, fs, gs );
1624     wait_suspend( &context );
1625     restore_context( &context, sigcontext );
1626 }
1627
1628
1629 /**********************************************************************
1630  *              get_signal_stack_total_size
1631  *
1632  * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1633  * Must be a power of two.
1634  */
1635 size_t get_signal_stack_total_size(void)
1636 {
1637     if (!signal_stack_size)
1638     {
1639         size_t size = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 );
1640         /* find the first power of two not smaller than min_size */
1641         while (size < min_size) size *= 2;
1642         signal_stack_mask = size - 1;
1643         signal_stack_size = size - teb_size;
1644     }
1645     return signal_stack_size + teb_size;
1646 }
1647
1648
1649 /***********************************************************************
1650  *           __wine_set_signal_handler   (NTDLL.@)
1651  */
1652 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1653 {
1654     if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1655     if (handlers[sig] != NULL) return -2;
1656     handlers[sig] = wsh;
1657     return 0;
1658 }
1659
1660
1661 /**********************************************************************
1662  *              signal_init_thread
1663  */
1664 void signal_init_thread( TEB *teb )
1665 {
1666     struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
1667     LDT_ENTRY fs_entry;
1668     stack_t ss;
1669
1670 #ifdef __APPLE__
1671     int mib[2], val = 1;
1672
1673     mib[0] = CTL_KERN;
1674     mib[1] = KERN_THALTSTACK;
1675     sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1676 #endif
1677
1678     ss.ss_sp    = (char *)teb + teb_size;
1679     ss.ss_size  = signal_stack_size;
1680     ss.ss_flags = 0;
1681     if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
1682
1683     wine_ldt_set_base( &fs_entry, teb );
1684     wine_ldt_set_limit( &fs_entry, teb_size - 1 );
1685     wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
1686     wine_ldt_init_fs( thread_data->fs, &fs_entry );
1687     thread_data->gs = wine_get_gs();
1688 }
1689
1690 /**********************************************************************
1691  *              signal_init_process
1692  */
1693 void signal_init_process(void)
1694 {
1695     struct sigaction sig_act;
1696
1697     sig_act.sa_mask = server_block_set;
1698     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1699 #ifdef SA_ONSTACK
1700     sig_act.sa_flags |= SA_ONSTACK;
1701 #endif
1702
1703     sig_act.sa_sigaction = int_handler;
1704     if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1705     sig_act.sa_sigaction = fpe_handler;
1706     if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1707     sig_act.sa_sigaction = abrt_handler;
1708     if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1709     sig_act.sa_sigaction = quit_handler;
1710     if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
1711     sig_act.sa_sigaction = usr1_handler;
1712     if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1713
1714     sig_act.sa_sigaction = segv_handler;
1715     if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1716     if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1717 #ifdef SIGBUS
1718     if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1719 #endif
1720
1721 #ifdef SIGTRAP
1722     sig_act.sa_sigaction = trap_handler;
1723     if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1724 #endif
1725
1726 #ifdef __HAVE_VM86
1727     sig_act.sa_sigaction = usr2_handler;
1728     if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1729 #endif
1730
1731     return;
1732
1733  error:
1734     perror("sigaction");
1735     exit(1);
1736 }
1737
1738
1739 #ifdef __HAVE_VM86
1740 /**********************************************************************
1741  *              __wine_enter_vm86   (NTDLL.@)
1742  *
1743  * Enter vm86 mode with the specified register context.
1744  */
1745 void __wine_enter_vm86( CONTEXT *context )
1746 {
1747     EXCEPTION_RECORD rec;
1748     int res;
1749     struct vm86plus_struct vm86;
1750
1751     memset( &vm86, 0, sizeof(vm86) );
1752     for (;;)
1753     {
1754         restore_vm86_context( context, &vm86 );
1755
1756         ntdll_get_thread_data()->vm86_ptr = &vm86;
1757         merge_vm86_pending_flags( &rec );
1758
1759         res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1760         if (res < 0)
1761         {
1762             errno = -res;
1763             return;
1764         }
1765
1766         save_vm86_context( context, &vm86 );
1767
1768         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1769         rec.ExceptionRecord  = NULL;
1770         rec.ExceptionAddress = (LPVOID)context->Eip;
1771         rec.NumberParameters = 0;
1772
1773         switch(VM86_TYPE(res))
1774         {
1775         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1776             rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1777             break;
1778         case VM86_TRAP: /* return due to DOS-debugger request */
1779             switch(VM86_ARG(res))
1780             {
1781             case TRAP_x86_TRCTRAP:  /* Single-step exception */
1782                 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1783                 break;
1784             case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1785                 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
1786                 /* fall through */
1787             default:
1788                 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1789                 break;
1790             }
1791             break;
1792         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1793             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1794             rec.NumberParameters = 1;
1795             rec.ExceptionInformation[0] = VM86_ARG(res);
1796             break;
1797         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1798             context->EFlags |= VIF_FLAG;
1799             context->EFlags &= ~VIP_FLAG;
1800             get_vm86_teb_info()->vm86_pending = 0;
1801             rec.ExceptionCode = EXCEPTION_VM86_STI;
1802             break;
1803         case VM86_PICRETURN: /* return due to pending PIC request */
1804             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1805             break;
1806         case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1807         default:
1808             WINE_ERR( "unhandled result from vm86 mode %x\n", res );
1809             continue;
1810         }
1811         __regs_RtlRaiseException( &rec, context );
1812     }
1813 }
1814
1815 #else /* __HAVE_VM86 */
1816 /**********************************************************************
1817  *              __wine_enter_vm86   (NTDLL.@)
1818  */
1819 void __wine_enter_vm86( CONTEXT *context )
1820 {
1821     MESSAGE("vm86 mode not supported on this platform\n");
1822 }
1823 #endif /* __HAVE_VM86 */
1824
1825 /**********************************************************************
1826  *              DbgBreakPoint   (NTDLL.@)
1827  */
1828 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
1829
1830 /**********************************************************************
1831  *              DbgUserBreakPoint   (NTDLL.@)
1832  */
1833 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
1834
1835 /**********************************************************************
1836  *           NtCurrentTeb   (NTDLL.@)
1837  */
1838 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
1839
1840
1841 /**********************************************************************
1842  *              EXC_CallHandler   (internal)
1843  *
1844  * Some exception handlers depend on EBP to have a fixed position relative to
1845  * the exception frame.
1846  * Shrinker depends on (*1) doing what it does,
1847  * (*2) being the exact instruction it is and (*3) beginning with 0x64
1848  * (i.e. the %fs prefix to the movl instruction). It also depends on the
1849  * function calling the handler having only 5 parameters (*4).
1850  */
1851 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1852 "       pushl   %ebp\n"
1853 "       movl    %esp, %ebp\n"
1854 "       pushl   %ebx\n"
1855 "       movl    28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1856 "       pushl   24(%ebp)\n"
1857 "       pushl   20(%ebp)\n"
1858 "       pushl   16(%ebp)\n"
1859 "       pushl   12(%ebp)\n"
1860 "       pushl   8(%ebp)\n"
1861 "       call    " __ASM_NAME("call_exception_handler") "\n"
1862 "       popl    %ebx\n"
1863 "       leave\n"
1864 "       ret\n"
1865 )
1866 __ASM_GLOBAL_FUNC(call_exception_handler,
1867 "       pushl   %ebp\n"
1868 "       movl    %esp, %ebp\n"
1869 "       subl    $12,%esp\n"
1870 "       pushl   12(%ebp)\n"       /* make any exceptions in this... */
1871 "       pushl   %edx\n"           /* handler be handled by... */
1872 "       .byte   0x64\n"
1873 "       pushl   (0)\n"            /* nested_handler (passed in edx). */
1874 "       .byte   0x64\n"
1875 "       movl    %esp,(0)\n"       /* push the new exception frame onto the exception stack. */
1876 "       pushl   20(%ebp)\n"
1877 "       pushl   16(%ebp)\n"
1878 "       pushl   12(%ebp)\n"
1879 "       pushl   8(%ebp)\n"
1880 "       movl    24(%ebp), %ecx\n" /* (*1) */
1881 "       call    *%ecx\n"          /* call handler. (*2) */
1882 "       .byte   0x64\n"
1883 "       movl    (0), %esp\n"      /* restore previous... (*3) */
1884 "       .byte   0x64\n"
1885 "       popl    (0)\n"            /* exception frame. */
1886 "       movl    %ebp, %esp\n"     /* restore saved stack, in case it was corrupted */
1887 "       popl    %ebp\n"
1888 "       ret     $20\n"            /* (*4) */
1889 )
1890 #endif  /* __i386__ */